Default Grades and Unsubmitted Quizzes

I've tried to find the answer to this question by searching around, but haven't been able to do so. I'm curious about the functionality of the "Set Default Grade" option. I assigned a pre-test to my students, but want to just give them credit for having completed it (while still having the data for the questions they got right and wrong). I am leery about using the "Set Default Grade" because I worry that it will also change the score for any unsubmitted items to that score. Is that the case, or does it only change the score for those who have submitted. I don't want to have to go through 250 individual quizzes and fudge their grade up in quick grader to the full score if I can do it all at once without affecting the unsubmitted ones (I need students who haven't done it to see that it is negatively affecting their grade for not completing the assignment).

David, I'm not sure if you've seen this guide or not - How do I set a default grade for an assignment? - but if you read through it, it states that, "Default grades are automatically entered for all students who do not have a grade." And, "If you would like to overwrite existing grades for the assignment, select the Overwrite already-entered gradescheckbox."

To me this clearly reads that it would change the score for students who hadn't submitted.

David, I'm not sure if you've seen this guide or not - How do I set a default grade for an assignment? - but if you read through it, it states that, "Default grades are automatically entered for all students who do not have a grade." And, "If you would like to overwrite existing grades for the assignment, select the Overwrite already-entered gradescheckbox."

To me this clearly reads that it would change the score for students who hadn't submitted.